Plants in nute lock? please help

During week 2 of flower I believe I over nuted my plants and they rebelled with by curling down and it seemed to stunt their growth, the PH began to dip so I ended up flushing for 2 days. I noticed that any EC over 0.8 would drop the ph down by the morning. I would go to sleep at 6.1 and wake up at 5.5 to 5.4. I would start with an EC of 1.0 and would see the PH drops, once I drained a little and topped off with fresh water I would lower the EC to 0.7 and the ph would stay stable, it would even go up. When the ph went up I would top off with nuted water but again once the ec hit 0.9 I would get dips again. Problem now is I am in week 6 and the kolas are no longer packing on weight and I am worried that something is seriously wrong because at this point they should be feeding like crazy but they still do not desire anything above 0.8. Any clue what could be going wrong?


I am running DWC 2 20 bucket systems.

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Question - Are you using tap or filtered water??

Using EC to measure your nute solution is good however most people convert that measurement to ppm's AKA - TDS - Total Dissolved Solids. It's a little easier to understand with ppm's. If you don't have a ppm meter you can multiply your EC measurement by 1000 then divide by 2 and that will give you your ppm count.

At an EC of 1.0 your ppm is 500. 500 ppm's will not cause a nute lockout. Your plant(s) might be suffering from a deficiency. You said that they don't like anything above 0.8 EC. At 0.8 EC you are at only 400 ppm's. During week 6 of flowering your plants are asking for food!!!! This is why the buds aren't getting phatter. When I was doing hydro applications, I would have my ppm's at 1100-1200 during week 6 of bloom. That would be an EC of 2.2-2.4.......

Not really sure. Fill out the troubleshooting form so we can have a complete understanding of what your growing conditions are......

CanGroIt::::::

What is your experience level? Novice (second grow)
Your Equipment:
.1) Type and wattage of lights. Sodiums 1,000
.2) 24 inches
.3) Reflector type? enclosed
.4) Is there a consistent fresh air supply? yes
.5) Do you have an exhaust fan and a circulation fan? yes 4 circulation fans and 12" exhaust
.6) What are the bulb wattages, kelvin ratings, and schedule? 1,000 watt 12/12 schedule

Your medium:
.7) Using DWC circulating bucket system.
.8) Size of container.
.9) Did you use peat pucks (or similar) to root clones or germinate seedlings?

Your nutrients and water:
10) Source of water? Tap, PH is usually around 7.4 before adusting.
11) Method of checking water ph. Blue Lab PH/EC meter
12) Method of adjusting water ph.PH Down
13) Specific brand and N-P-K ratio for each bottle. using H & G fresh nutes every monday.
14) How often are you watering between feedings, and how much per watering?
15) Any additives or tea's? Open Sesame during the last week of Veg and first 2 weeks of flower. Cal Mag first 3 weeks.
16) Are your ph levels stable, or do they fluctuate? They have been dropping when my EC is higher than 0.8
17) What is your ingoing water's ph? Ph will drop from 6.1 to 5.4 over night
18) Do you foliar feed? Magic Green every other week twice. 5 ml per g

Your growroom:
19) Indoors or outdoors? Indoors
20) What size of closet, room or hut? Room is 24 by 12
21) What are the temps and humidity levels while lights are on? Temps are between 78 to 83 when lights are on, humidity 50% temps ate 65 to 70 when lights are off.
22) Have you seen signs of insects in the growroom? Spidermites early on, sprayed and isolated plant. No sign since.

Your strain:
23) What strain are you growing? Indica Dominant (SD, CD)
24) From seeds or clones? Clones
25) Is this an autoflower strain? No.

This could very well be a deficiency prob. You said that you stopped giving cal mag. Why? I don't have any experience with the nutes you are using so I can't really help there but your EC is kinda low for week 6 of bloom. You also need to take into account that the tap water you are using has minerals in it. So the ppm's from the tap plus the ppm's from your nutes is not enough for your plant anymore. Tap water never worked for me while utilizing hydro but that was me. Usually most people use RO water when going hydro. Also a Ph of 5.4-5.5 is really where you want it to be during flowering. A Ph of 6.1 will only decrease the amount of K your plant will intake. 6.1 is on the higher end of good for vegging period. The lower end of 5-6 is where you want to be for flowering.

Maybe someone who is currently doing hydro will jump in......

Have any pics to go with these probs?